#11013 NORM 1.75-fi: Coordinate audio components init in OFW and Linux

[Zarro Boogs per Child]

#11013: Coordinate audio components init in OFW and Linux
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 Reporter:  martin.langhoff      |                 Owner:  wmb at firmworks.com
     Type:  task                 |                Status:  new              
 Priority:  normal               |             Milestone:  1.75-firmware    
Component:  ofw - open firmware  |               Version:  not specified    
 Keywords:                       |           Next_action:  design           
 Verified:  0                    |   Deployment_affected:                   
Blockedby:                       |              Blocking:                   
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 Current linux kernel driver (os10 to os12) works correctly with Q3A13f --
 but not with Q3A13 nor with Q3A14 or newer.

 The Q3A13 to Q3A14 series made a lot of progress on the audio front, so
 changes in the register state are to be expected during that series.

 Now that things have settled, we probably need to establish a sane state
 in which OFW leaves the audio components, and Linux expects, document and
 (if needed) implement it.

 Alternatively, Linux could just reset all registers to a known state --
 hopefully this doesn't cause output or delays.

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Ticket URL: <http://dev.laptop.org/ticket/11013>
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